Abstract
Elucidation of an inhibitory system in the regulation of emesis is presented in this report. Emesis preceded by retching, can be induced in the dog by appropriate electrical stimulation of abdominal vagus nerves at the supradiaphragmatic level. Failure to produce retching or emesis by electrical stimulation of the cervical vagus trunk suggests either that the abdominal vagal emetic afferent does not course in the cervical vagus or that fibers inhibitory to emesis are present. This report presents evidence for afferent fibers inhibitory to retching and emesis in the cervical vagus. Retching and emesis resulting from stimulation of the supradiaphragmatic vagus can be prevented by either transection of the cervical vagus or simultaneous stimulation of the cervical vagus trunk. In addition, retching and emesis occur with stimulation of a fine nerve bundle dissected from the cervical vagus trunk. That the afferent pathway inhibitory to retching and emesis involves pulmonary afferents is suggested by the observation that hyperventilation occurs with stimulation of the cervical vagus trunk.
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Research supported by U.S.P.H.S. Grant No. FR05339-07
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Zabara, J., Chaffee, R.B. & Tansy, M.F. Neuroinhibition in the regulation of emesis. Space Life Sciences 3, 282–292 (1972). https://doi.org/10.1007/BF00928176
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DOI: https://doi.org/10.1007/BF00928176